Abstract
A cluster of multi-anode photomultiplier tubes (MaPMTs) equipped with focusing lenses in front of the tubes was tested in a prototype ring imaging Cherenkov (RICH) detector in a charged particle beam. The readout electronics were capable of capturing the data at 40 MHz. The effects due to charged particles and magnetic field on the MaPMT performance were also studied. The results are used to evaluate the MaPMT as a possible photodetector for the LHCb RICH detectors.
Highlights
This paper reports on the performance of Multi– anode Photomultiplier Tubes (MaPMTs) for the detection of Cerenkov light in a prototype Ring Imaging Cerenkov (RICH) detector
The MaPMTs are the back–up option1 for the photodetector to be used in the RICH detectors of the LHCb experiment [2] at the future Large Hadron Collider (LHC) at CERN
The performance studies presented here include, for the first time, those where the MaPMT data have been captured at 40 MHz, which is the bunch crossing rate of the LHC
Summary
This paper reports on the performance of Multi– anode Photomultiplier Tubes (MaPMTs) for the detection of Cerenkov light in a prototype Ring Imaging Cerenkov (RICH) detector. The MaPMTs are the back–up option for the photodetector to be used in the RICH detectors of the LHCb experiment [2] at the future Large Hadron Collider (LHC) at CERN. The performance studies presented here include, for the first time, those where the MaPMT data have been captured at 40 MHz, which is the bunch crossing rate of the LHC. A full description of the desired physics performance of LHCb and the subsequent requirements on the RICH detector can be found elsewhere [3]. A photodetector that meets these requirements must be both sensitive to single photons and spatially precise to a few millimetres. The device and accompanying electronics must have a fast enough response to be read out in 25 ns
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